Here's a seemingly simple puzzle.
Place four coins on the bottom row of circles (G, D, E, and R), leaving the letters MARTIN exposed. Your challenge is to slide the coins along the paths joining the circles so that the four coins cover the top row of circles (M, T, I, and blank), exposing the letters GARDNER.
Read more:http://www.sciencenews.org/view/generic/id/6694/title/Sliding_Around
Read more:http://www.sciencenews.org/view/generic/id/6694/title/Sliding_Around